Business Acquisitions (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Business Acquisition [Line Items]
Finite-lived intangible asset		$ 5,800
Marine & Remote Sensing Solutions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	375
DigitalOptics Charlotte
Business Acquisition [Line Items]
Finite-lived intangible asset	2,520
Patented Technology [Member] | DigitalOptics Charlotte
Business Acquisition [Line Items]
Finite-lived intangible asset	2,000
Finite-Lived Intangible Asset, Useful Life	12 years
Order or Production Backlog [Member] | DigitalOptics Charlotte
Business Acquisition [Line Items]
Finite-lived intangible asset	150
Finite-Lived Intangible Asset, Useful Life	2 years
Customer relationships | DigitalOptics Charlotte
Business Acquisition [Line Items]
Finite-lived intangible asset	$ 370
Finite-Lived Intangible Asset, Useful Life	2 years 6 months